(2R,4R)-4-((2E,7E)-(1S,4S,9S)-9-Hydroxy-1-methoxy-4,8-dimethyl-6-methylene-undeca-2,7-dienyl)-2-(2,4,6-trimethyl-phenyl)-[1,3]dioxolane-4-carboxylic acid methyl ester 在
吡啶 、
4-二甲氨基吡啶 、
potassium tert-butylate 、
溶剂黄146 、
lithium hexamethyldisilazane 作用下,
以
六甲基磷酰三胺 为溶剂,
生成 (7E,12E)-(3R,5R,6S,9S,14S)-14-Ethyl-5-hydroxy-5-hydroxymethyl-6-methoxy-3,9,13-trimethyl-11-methylene-oxacyclotetradeca-7,12-diene-2,4-dione